There seems to be a lot of confusion, both in retail stores and in the forums, about what Dual Link is and when you need to know about it.
Single link connections are most common, though many video cards now support dual link. A DVI single link computer monitor can display a resolution of 1920 x 1200. My Panasonic 42″ Plasma television is HD and has a screen resolution of 1024 X 720. Some much larger TV’s have screen resolutions of 2560 x 1600. If you’re using a HTPC (connecting your computer to your TV as a media center TV) you should check your user guides to see what resolution your TV is and whether it supports Dual Link. If there is no mention of Dual Link then it most likely doesn’t support Dual Link.
Dual Link requires the correct cable and, while not being directly related to screen image quality, you can have high resolution capability and higher (faster) refresh rates.
We have found Jemmell Cables in Australia to be a good source of online cables and advice.